[1] [1] K. Scholle, E. Heumann, and G. Huber, Laser Phys. Lett. 1, 285 (2004).

[2] [2] B.-Q. Yao, W.-J. He, Y.-Z. Wang, X.-B. Zhang, and Y.-F. Li, Chin. Phys. Lett. 21, 2182 (2004).

[3] [3] J. G. Daly, Proc. SPIE 1419, 94 (1991).

[4] [4] S. D. Jackson and A. Lauto, Lasers Surg. Med. 30, 184 (2002).

[5] [5] M. C. Pierce, S. D. Jackson, M. R. Dickinson, and T. A. King, Lasers Surg. Med. 25, 407 (1999).

[6] [6] N. M. Frid, Lasers Surg. Med. 36, 52 (2005).

[7] [7] N. M. Frid, Surg. Med. 37, 53 (2005).

[8] [8] W.-J. He, B.-Q. Yao, Y.-L. Ju, and Y.-Z. Wang, Opt. Express 14, 11653 (2006).

[9] [9] B.-Q. Yao, X.-M. Duan, L.-L. Zheng, Y.-L. Ju, Y.-Z. Wang, G.-J. Zhao, and Q. Dong, Opt. Express 16, 14668 (2008).

[10] [10] X. Zhang, Y. Ju, and Y. Wang, Opt. Express 13, 4056 (2005).

[11] [11] M. Eichhorn and S. D. Jackson, Opt. Lett. 32, 1672 (2006).

[12] [12] M. Eichhorn, Opt. Lett. 32, 1056 (2007).

[13] [13] M. Eichhorn and S. D. Jackson, Opt. Lett. 33, 1044 (2008).

[14] [14] C. Gao, S. Zhu, W. Zhao, Z. Cao, and Z. Yang, Chin. Opt. Lett. 7, 611 (2009).

[15] [15] X. Huang, B, Guo, W. Yang, G. Chen, X. Gong, Y. Kong, D. Li, X. Li, Z. Sui, M. Li, and J. Wang, Chin. Opt. Lett. 8, 712 (2009).

[16] [16] J. Limpert, S. Hoer, A. Liem, H. Zellmer, A. Tunermann, S. Knoke, and H. Voelckel, Appl. Phys. B 75, 477 (2002)

[17] [17] R. L. Farrow, D. A. V. Kliner, P. E. Schrader, A. A. Hoops, S. W. Moore, G. R. Hadley, and R. L. Schmitt, Proc. SPIE 6102, 61020 (2006).